Trisiloxanes



United States Patent TRISILOXANES Harold A. Clark and Loren A. Haluska,Midland, Mich., assignors to Dow Corning Corporation, Midland, Mich., acorporation of Michigan No Drawing. Application November 29, 1956 SerialNo. 624,979

3 Claims. (Cl. 260-4482) Ph MeQHSiOEEIOSiHMe:

in which R is methyl or phenyl.

e above compounds may be prepared by cohydrolyzing dimethylchlorosilanewith phenylmethyldichlorosilane products by distillation.

The products of this invention are compatible with phenylvinylsiloxanecasting resins. Consequently, they the aforesaid Clark application.

The following examples are illustrative of this invention.

"2,877,256, Patented Mar. 10, 1959 Example 1 A mixture of 2839 g. ofmethyldichlorosilane and 1911 g. of phenylmethyldi-chlorosilane wasadded with agitation to an excess of water. The liquid hydrolyzate waswashed until neutral and the product was distilled to give 1866 g. of

Ph MEzHSlO SiOSlMezH Me boiling point of 88 C. at 6 mm., C. of .923 anda refractive index This compound had a a specific gravity at 25 at 25 C.of 1.4471.

Example 2 360 ml. of water were added slowly with cooling and agitationto a mixture of 506 g. of diphenyldichlorosilane The hydrolyzate waswashed free of acid and the product distilled to give PhzMGzHSiOSlOSiHMEz This compound boils at 137 C. at 2.8 refractive indexat 25 C. of 1.5000.

That which is claimed is: 1. A composition of the formula mm. and has aPh MeflsiOgiOSiHMe:

in which R is selected from the group consisting of methyl and phenylradicals.

2. A composition of the formula P1]: MeaHSlOSiOSlHMe: 3. A compositionof the formula References Cited in the file of this patent UNITED STATESPATENTS 2,547,678 Wilcock et a1. Apr. 3, 1951

1. A COMPOSITION OF THE FORMULA